#include <stdio.h>
int main(){
    int a,b,c,res=2;
    printf("enter 2 number:\n");
    res=scanf("%d %d",&a,&b);
    if (res!=2){printf("wrong!please enter right int number\n");}
    if (res==2){ c=a*b%65537;
    printf("a*b mod65537=%d\n",c);
    return 0;}
}